hi to position a hole accuratly it is advisable to use a centre drill or spotting drill first to a depth of say 3 mm.
The spotting drill usually costs a bit more but the life is much greater. (spotting drills are used to mark new holes from old parts or PCDS) hope this helps
Don
Quote
If the finest genius studies at one of our colleges, and is not installed in an office within one year afterwards in the cities or suburbs of Boston or New York, it seems to his friends and to himself that he is right in being disheartened, and in complaining the rest of his life. A sturdy lad from New Hampshire or Vermont, who in turn tries all the professions, who _teams it_, _farms it_, _peddles_, keeps a school, preaches, edits a newspaper, goes to Congress, buys a township, and so forth, in successive years, and always, like a cat, falls on his feet, is worth a hundred of these city dolls. He walks abreast with his days, and feels no shame in not `studying a profession,' for he does not postpone his life, but lives already. He has not one chance, but a hundred chances.
Self-Reliance
from Essays: First Series (1841)
by
Ralph Waldo Emerson  |